Shear Strength and Cracking Process of Non-persistent Jointed Rocks: An Extensive Experimental Investigation

Asadizadeh, Mostafa; Moosavi, M.; Hossaini, Mohammad Farouq; Masoumi, Hossein

doi:10.1007/s00603-017-1328-6

Cited by 87 publications

(26 citation statements)

References 36 publications

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“…A rock mass is a natural geological material that is formed of two components, intact rock and discontinuity (Asadizadeh et al 2018b;. The term discontinuity generally includes fractures, ssures, joints, faults, and bedding planes (Mas Ivars et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Tensile behavior of a Brazilian Disk Containing non-persistent Joint Sets Subjected to Diametral Loading: An Experimental Investigation

Asadizadeh

Shakeri

Babanouri

et al. 2021

Preprint

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Structural defects are part of the inherent characteristics of rock masses. They can be found in the form of fishers, joints, and beddings and can be divided into persistent or non-persistent one. The coalescence of non-persistent cracks may lead to the formation of persistent joints under the tensile stress field, leading to instability of rock mass. The mechanical behavior of non-persistent jointed disks under tensile stress has essential implications for rock engineering structures. In this paper, concrete Brazilian disks containing open non-persistent joints were constructed and subjected to diametral loading to investigate the effect of this kind of joint parameters on the tensile strength and stiffness of disks. The effect of some parameters, such as joint continuity factor (the relationship between joint length and rock bridge length), bridge angle, joint spacing, and loading direction with respect to joint angle were investigated to estimate the tensile strength and stiffness as well as failure pattern. The results of experiments revealed that the tensile strength, stiffness, and failure pattern of Brazilian disks are highly affected by non-persistent pre-existing crack parameters. The increase of joint continuity factor and loading direction leads to an increase in tensile strength and a decrease in stiffness. However, when bridge angle and spacing increase tensile strength rises, and the former decreases stiffness while the latter results in its reduction. Finally, all the parameters significantly affect the failure pattern, and some failure patterns such as step-path failure, splitting, or sliding may occur as a function of non-persistent joint parameters.

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Section: Introductionmentioning

confidence: 99%

Tensile behavior of a Brazilian Disk Containing non-persistent Joint Sets Subjected to Diametral Loading: An Experimental Investigation

Asadizadeh

Shakeri

Babanouri

et al. 2021

Preprint

Self Cite

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“…Work investigating the shear strength of the interface between the rock and surrounding materials is represented by Johnston and Lam (1989), Koupouli et al (2016), Krounis et al (2016) and Li et al (2015). Asadizadeh et al (2018) conducted an experimental study on non-persistent joints. Indraratna et al 2014performed characterization of asperity deformation.…”

Section: Introductionmentioning

confidence: 99%

An Approach to Compensate for the Influence of the System Normal Stiffness in CNS Direct Shear Tests

Larsson

Flansbjer

2020

Rock Mech Rock Eng

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Applying accurate normal load to a specimen in direct shear tests under constant normal stiffness (CNS) is of importance for the quality of the resulting data, which in turn influences the conclusions. However, deficiencies in the test system give rise to a normal stiffness, here designated as system normal stiffness, which results in deviations between the intended and actual applied normal loads. Aiming to reduce these deviations, this paper presents the effective normal stiffness approach applicable to closed-loop control systems. Validation through direct shear tests indicates a clear influence of the system normal stiffness on the applied normal load (13% for the test system used in this work). The ability of the approach to compensate for this influence is confirmed herein. Moreover, it is demonstrated that the differences between the measured and the nominal normal displacements are established by the normal load increment divided by the system normal stiffness. This further demonstrates the existence of the system normal stiffness. To employ the effective normal stiffness approach, the intended normal stiffness (user defined) and the system normal stiffness must be known. The latter is determined from a calibration curve based on normal loading tests using a stiff test dummy. Finally, a procedure is presented to estimate errors originating from the application of an approximate representation of the system normal stiffness. The approach is shown to effectively reduce the deviations between intended normal loads and the actual applied normal loads.

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“…Asadizadeh et al conducted a number of direct shear tests on non-persistent jointed rocks and studied the effects of bridge length, bridge angle, joint roughness, and normal stress on the shear strength and the cracking process. The results revealed that the normal stress and the bridge angle had the maximum and minimum effects on shear strength, respectively [23]. Wu et al investigated the shear rheology in sandstone with non-persistent joints, and the results indicated that long-term shear strength is influenced by the long-term internal friction angle and the cohesion, and a decreased cohesion is a key factor for changes in the long-term shear strength under a constant load [24].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

et al. 2018

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Due to the complex formation process of a rock mass, a large number of fissures, joints, faults, other defects exist and the defects commonly contain infilled materials. The jointed rock masses are in a complex geological environment, in which the geometric distribution and the boundary condition can greatly affect the mechanical behavior of the infilled jointed rock mass. In this study, the infilled jointed rock mass specimens with different dip angles are prepared using similar materials, and the uniaxial and biaxial compression tests on the specimens are conducted. The effect of the joint dip angle on the mechanical behavior of the infilled jointed rock mass under uniaxial and biaxial compressions is investigated. The results show that the uniaxial compressive strength shows a W-shaped variation, and the biaxial compressive strength shows a V-shaped variation with an increase in the dip angle. Most of the cracks appear in pairs around the joint and occur symmetrically in a bilateral distribution, and the existence of the infilled joints induces a nonlinear mechanical behavior in the specimen. In addition, the specimens exhibit three failure modes under uniaxial compression: splitting failure, step-path failure and planar failure. The specimens present two failure modes under biaxial compression: splitting failure and planar failure.

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Shear Strength and Cracking Process of Non-persistent Jointed Rocks: An Extensive Experimental Investigation

Cited by 87 publications

References 36 publications

Tensile behavior of a Brazilian Disk Containing non-persistent Joint Sets Subjected to Diametral Loading: An Experimental Investigation

Tensile behavior of a Brazilian Disk Containing non-persistent Joint Sets Subjected to Diametral Loading: An Experimental Investigation

An Approach to Compensate for the Influence of the System Normal Stiffness in CNS Direct Shear Tests

The Effect of Joint Dip Angle on the Mechanical Behavior of Infilled Jointed Rock Masses under Uniaxial and Biaxial Compressions

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